Tatiana Maslany has joined the 10-episode sci-fi drama, which begins shooting in October.

Canadian actress Tatiana Maslany has been cast in the lead role of the sci-fi drama as Sarah, an outsider, orphan and street-wise chameleon who has a murky past and tenuous future after she witnesses a woman's suicide. After deciding to assume the identity of the dead stranger who looks just like her, Sarah learns that she and the dead woman are clones. As she searches for answers, Sarah discovers that there are more out there.

From Temple Street Productions, filming on the 10-episode series will begin this October in Toronto. Additoinal castings will be announced shortly.

“Tatiana possesses all the intensity, charm and range that this complex role requires,” said Perry Simon, general manager, Channels, BBC Worldwide America. “She has all the makings of a breakout star.”

Maslany recently premiered Picture Day at the Toronto International Film Festival. On the TV side, she has appeared on Canadian drama Being Erica and World Without End.